Determinação de estimulantes anfetamínicos no fluido oral : especificidade dos métodos de triagem e análise confirmatória

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2010

RESUMO

The Brazil stands out on the world as a major consumer of amphetamine-type stimulants (ATS), and several national studies have shown high prevalence in the consumption of these substances by professional drivers. Oral fluid has many advantages over the conventional biological fluids for monitoring ATS use on roads, and has been employed with this purpose in several countries. The aim of this study is to assess the specificity/cross-reactivity of commercial oral fluid immunoassays in detecting the prescription ATS marketed in Brazil and to develop and validate a method for confirmation and quantification of amphetamine (AMP), methamphetamine (MET), amfepramone (DIE), fenproporex (FEN) and methylphenidate (MPH) in oral fluid by solid phase microextraction (SPME) and gas chromatography-mass spectrometry (GC-MS). Analytical specificity of immunoassays was evaluated through the study of the technical information of commercial products and through experimental testing of three kits. The confirmatory SPME-GC-MS method employed SPME immersion technique (DI-SPME), under magnetic stirring, at room temperature, using polydimethylsiloxane (30 ¿m) fibers, in-matrix propylchloroformate derivatization, Na2CO3 and Na2SO4 to increase both pH and ionic strength. Immunological tests currently available for ATS screening in oral fluid are imported and do not detect, even at high concentrations, the main ATS consumed in Brazil: FEN, MPH and DIE. The SPME-GC-MS method was linear for the studied ATS over the range of 2-256 ng.mL-1, except for FEN where the linear range was 4-256 ng.mL-1. The detection limits were 0.5 ng.mL-1 (MET), 1 ng.mL-1 (MPH) and 2 ng.mL-1 (DIE, AMP, FEN). Accuracy was within 98.2 ¿ 111.9% of the target concentrations and precision did not exceed 15% of relative standard deviation. The method was successfully applied to estimate the pharmacokinetic profile of FEN and AMP in oral fluid of six male subjects after administration of a single dose of 25 mg FEN hydrochloride.

ASSUNTO(S)

amphetamine anfetamina metanfetamina methamphetamine diethylpropion dietilpropiona fenproporex femproporex methylphenidate metilfenidato fluido oral oral fluid

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